Xx

X (also x) /eks/ noun, symbol

m noun {pi Xs, X^, x*s /'eksiz/) 1 [C, U] the 24th letter of the English alphabet英语字母表的第24个字母： ‘XyZophone’ begi’ns with fan) X/‘乂 * xylophone — 词以字 母‘x 并头。2 [U] 数）used to represent a

number whose value is not mentioned (代表未知数 > : The equation is impossible for any value of x greater than 么当x的值大于2时，这个等式不成立。3 [U] a person, a number, an influence, etc. that is not known or not named未知的人（或数、影响等）；未指明的人（或数、 影晌等）：let’s suppose X fcnows what F is doing.假设 X 知道 Y 正在干 ff 么。_ see also X chromosome, X-RATED, X-RAY

m symbol 1 the number 10 in Roman numerals ('罗马 数字、+):...。10 2 used to represent a kiss at the end of a letter, etc.(置于书信等南结尾，表示亲吻>:lovelorn KathyI爱你的凯西，吻你，吻你，吻你。3used to show a vote for sb in an election (在选举宁考示投给某 人的一票）：Wrtte X besfde the ccmdi’date 〇/your choice. 在你选择的候选人旁边打一个X。4 used to show that a written answer is wrong (表示书面答案是错的> _compare tick n.(l) 5 used to show position, for example on a map ( h以标明方位，如在‘图± ) : X marks the sppt. * X标由了所说的地点。

xan-than gum /'zaenGaen gAm; NAmE -Oan/ noun [u] {technical a chemical substance that is put in food to make it thicker黄胞胶，三仙胶（使食物变稠的化学 物质）

■X chromosome now/7 (b/o/ogy 生）a sex chromosome. Two X chromosomes exist in the cells of human females. In human males each cell has one X chromo- some and one Y chromosome. * X 染色体

xenon /'zennn; 'zi:-; NAmE -na:n/ noun [u] (symb Xe) a chemical element. Xenon is a gas that is found in very small quantities in the air and is used in some special electric lamps.^;氤；氣气

xeno-pho-bia /.zena'faubia; NAmE -'fou-/ noun [U] {disapproving) a strong feeling of dislike or fear of people from other countries仇舛„惧外（对外国人的厌恶或惧 怕）：a campaign against racism cmd jcenophobia 反对 #族‘主义和我外情绪袖运动► xeno.pho.bic /-_foobik; NAmE -'fou-/ adj.

xeno.trans.plan.ta.tion /zi:nau,traenspla:n'teiXn; -.traenz-; NAmE -plaen't-/ noun [U] {medical E) the process of taking organs from animals and putting them into humans for medical purposes (从动物到人体的）异种

器官移植

Xerox™ /'ziarDks; NAmE 'zirarks/ noun a process for producing copies of letters, documents, etc. using a special machine; a copy made using this process —乐 i印；施乐复印彳a Xerox machine施乐复印机 xerox /'ziarDks; NAmE 'ziraiks/ verb [VN] to make a copy of a letter, document, etc. by using Xerox or a similar process 复印；复制 K771 photocopy ： Could you xerojc this letter, p〖e〇5e?请复印一下这封信好吗？.

Xhosa /'ko:sa; 'kao-; NAmE 'koo-/ noun [U] a language spoken by the Xhosa people in South Africa (南非）科 .萨语

xi /sai; zai; ksai; gzai/ noun the 14th letter of the Greek alphabet (= 〇希腊字母表的第14个字母 Xiang (also Hsiang) /Jir'aeq/ noun [U] a form of Chinese spoken mainly in Hunan湘语；湘如言；湖南话 -xion -ion

XL /,eks 'el/ abbr. extra large (used for sizes of things, especially clothes)特大号（衣服尺码等 _): an XL T-shirt

一件特大号T恤衫

Xmas /'krismas; 'eksmas/ noun [C, \J] {informal) used as a short form of ‘Christmas’，usually in writing.’.圣诞节 (Christmas 的缩写^J) : A merry Xmas to all our readers!

祝广大读者圣诞快乐！

XML /.eks em ’el/ (c〇A77ptv"ng 计）Extensible Mark-up Language (a system used for marking the structure of text on a computer, for example when creating website pages)句•扩展置标语言，可扩展标记语言（制作网页等用 的文本结构标记系统）

■X-rated (especially of a film/movie 尤指电影）that people under 18 are not allowed to see because it contains sex and/or violence * X _ 级的，青少年本宜的 (充斥性和/或暴力而禁止18岁以下的青少年观看） X-ray /'eks rei/ noun, verb

mnoun 1 [usually pi ] a type of radiation that can pass through objects that are not transparent and make it possible to see inside them * X.射邊；X 光：an X-ray machine (= one that produces X-rays)爱克斯光机 2 a photograph made by X-rays, especially one showing bones or organs in the body * X'光.照片：a chest X-ray 胸部 X 光照片◊ 77ie doctor studied the X-rays 〇/ her Zungs.医生研究了她肺部的X光照片。々to tofce an X-ray 拍摄 X 光照片 3 a medical examination using X-rays 角 X舍•线也行的临床檯查：J had to go /or an X-ray.我得忐 做X光检查。

■ verb [VN] to photograph and examine bones and organs inside the body, using X-rays 用 X 射线拍摄检查：He had to have his chest X-rayed.他得逬行胸部X光检查。 xylem /'zailsm/ noun [U] {biology the material in plants that carries water and minerals upwards from the root木质部（植物中将水分和矿物质从根部同上输送 的组织 > —comparephloem xylo-phone /'zailafaun; NAmE -foun/ noun a musical instrument made of two rows of wooden bars of different lengths that you hit with two small sticks 呆琴 —compare glockenspiel — picture o page R8